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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Cancer+Res
2016 ; 76
(5
): 1089-100
Nephropedia Template TP
gab.com Text
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English Wikipedia
Bidirectional Notch Signaling and Osteocyte-Derived Factors in the Bone Marrow
Microenvironment Promote Tumor Cell Proliferation and Bone Destruction in
Multiple Myeloma
#MMPMID26833121
Delgado-Calle J
; Anderson J
; Cregor MD
; Hiasa M
; Chirgwin JM
; Carlesso N
; Yoneda T
; Mohammad KS
; Plotkin LI
; Roodman GD
; Bellido T
Cancer Res
2016[Mar]; 76
(5
): 1089-100
PMID26833121
show ga
In multiple myeloma, an overabundance of monoclonal plasma cells in the bone
marrow induces localized osteolytic lesions that rarely heal due to increased
bone resorption and suppressed bone formation. Matrix-embedded osteocytes
comprise more than 95% of bone cells and are major regulators of osteoclast and
osteoblast activity, but their contribution to multiple myeloma growth and bone
disease is unknown. Here, we report that osteocytes in a mouse model of human MM
physically interact with multiple myeloma cells in vivo, undergo
caspase-3-dependent apoptosis, and express higher RANKL (TNFSF11) and sclerostin
levels than osteocytes in control mice. Mechanistic studies revealed that
osteocyte apoptosis was initiated by multiple myeloma cell-mediated activation of
Notch signaling and was further amplified by multiple myeloma cell-secreted TNF.
The induction of apoptosis increased osteocytic Rankl expression, the osteocytic
Rankl/Opg (TNFRSF11B) ratio, and the ability of osteocytes to attract osteoclast
precursors to induce local bone resorption. Furthermore, osteocytes in contact
with multiple myeloma cells expressed high levels of Sost/sclerostin, leading to
a reduction in Wnt signaling and subsequent inhibition of osteoblast
differentiation. Importantly, direct contact between osteocytes and multiple
myeloma cells reciprocally activated Notch signaling and increased Notch receptor
expression, particularly Notch3 and 4, stimulating multiple myeloma cell growth.
These studies reveal a previously unknown role for bidirectional Notch signaling
that enhances MM growth and bone disease, suggesting that targeting
osteocyte-multiple myeloma cell interactions through specific Notch receptor
blockade may represent a promising treatment strategy in multiple myeloma.